Electric wire insulating cover

ABSTRACT

A covering apparatus for insulating electric wires, said covering apparatus being made of material having properties of insulation and formation-flexibility under heat such as synthetic resins, said apparatus comprising a longitudinally-split cylindrical body to hold the electric wire firmly therein and also enabling the cylindrical body to overlap at the terminal portions thereof, and two longitudinal projections extending outwardly therefrom at the terminal portions each of which is situated at a different distance from the split. The two projections under the effect of the inward resilience of the cylindrical body abut one another at the tips but are separated some distance at the portions from which they project so as to form a triangular space between the two projections.

United States Patent l l Yotsugi I 1 ELECTRIC WIRE INSULATING COVERMasamitsu Yotsugi, No. 1-9, S-chome Fukatacho. Naka-ku. Kohe-shi.Hyogo-ken. Japan [22] Filed: May 2. 1974 1] Appl. No.: 466.128

[76} Inventor:

[521 US. Cl ..174/5 R; 174/136; 174/21 1 [51] Int. Cl. "11018 17/58 [58]Field of Search H 174/5 R. 40 R. 136. 138 R.

[ 1 Aug. 19, 1975 1 ABSTRACT A covering apparatus for insulatingelectric wires said covering apparatus being made of material havingproperties of insulation and formation-flexibility under heat such assynthetic resins. said apparatus comprising a longitudinally-splitcylindrical body to hold the electric wire firmly therein and alsoenabling the cylindrical body to overlap at the terminal portionsthereof. and two longitudinal projections extending outwardly therefromat the terminal portions each of which is situated at a differentdistance from the split. The two projections under the effect of theinward resilience of the cylindrical body abut one another at the tipsbut are separated some distance at the portions from which they projectso as to form a triangular space between the two projections.

1 Claim. 5 Drawing Figures PATENTEBAUG 1 9191s 3 900 697 FIG] FIG. 5FIGA PRIOR ART PRIOR ART 1 ELECTRIC WIRE INSULATING COVER BACKGROUND OFTHE INVENTION The present invention relates to a cylindrical appara tusfor insulating high voltage electric wires by means of covering over thewires and more particularly a cylindrical apparatus for insulating highvoltage electric wires during a rainstorm.

BRIEF REVIEW OF THE PRIOR ART Electric insulating covers areconventionally provided on high voltage electric wires particularly whenstretched near structures, trees and the like so as to prevent the wiresfrom having a short circuit which may cause accidents such as fire,electric shock, etc., as a result of touching of the wires tostructures, trees and the like.

These conventional covers also of cylindrical form, however, aredefective since it is not possible to prevent rainwater-infiltrationthrough the break which is provided longitudinally for fitting them overwires.

SUMMARY OF THE INVENTION Briefly stated, the present inventioncontemplates employing as wire-covering a cylindrical apparatus soconstructed as to prevent the infiltration ofi'rainwater into thecylinder at the opening thereof.

Thus, the first object of the present invention is to provide anelectric wire insulating cover capable of preventing the infiltration ofrainwater thereinto at the opening thereof, said opening being providedfor detachably fitting the apparatus over the wire.

A second object of the present invention ,is to provide an electric wireinsulating cover which can'be produced at a low cost.

These objects can be accomplished by the improve ment, combination andoperation of every partconsti tuting the present invention, thepreferred embodiment of which will be described in detail in relationwith the annexed drawing in which: m

BRIEF DESCRIPTION OF THE'DRAY INGS FIG. 1 shows a perspective view of anelectric wire insulating apparatus in actual usage.

FIG. 2 is a vertical section of the above.

FIG. 3 is a vertical section of the above apparatus immediately aftercoming out from an extruding machine.

FIG. 4 is a vertical section of a conventional electric wire insulatingapparatus in actual usage.

FIG. 5 is a vertical section of the apparatus in FIG. 4 immediatelyafter coming out from an extruding machine.

DETAILED DESCRIPTION In the embodiment shown in FIGS. I to 3, Adesignates an electric wire insulating apparatus Comprising a splitcylindrical body 11, and two projections I2 and l3 longitudinallyextending outward from the cylindrical body 11 at the outer periphery atthe terminal portions I5 and I6 thereof, respectively, terminal portion16 being narrower than terminal portion I5 as shown in FIG. I.

The covering apparatus A, made of material which has the properties ofinsulation and formation-flexibility under heat, such as polyethylene orthe like. is produced in the form of a lengthy cylinder with the use ofan extruding machine. said lengthy product being cut into several piecesin accordance with the length required for covering a wire.

The cylindrical apparatus A is provided with inward resilience duringthe process of its manufacture under heated pressing so that theapparatus A has an inward grip so as to hold the wire firmly therein.

The cylindrical body II is split lengthwise at break I4 shown in FIG. 3and is shaped so as to overlap at terminal portions 15 and I6 thereof asshown in FIG. I, projections I2 and I3 extending outwards from tenninalportions 15 and I6. Projections l2 and I3 aresituated at differentdistances from the break I4 so as to form a triangular space between theprojections I2 and I3 when the apparatus A takes a cylindrical shapewhen fitting over an electric wire with said projections 12 and I3abutting one on the other at both tips thereof, as shown in FIGS. 1 and2.

- The apparatus A is disposed over electric wire 8 as shown in FIG. 2.The apparatus A can be opened at the break 14 to place it over electricwire B. the inwardly resilient grip of the apparatus A enabling it tofirmly "maintain the cylindrical form and hold the projections :12 andI3 in side by side abutment at the tips thereof.

-.In the case of a conventional electric wire insulating apparatus Cshown in FIGS. 4 and 5, one projection I2 extends outward at the break14 whereas the other projection 13 extends outward at apredeterrnineddistance therefrom, with the result that the projectionsIZand I3 inwardly abut on eachother at the entire; surface thereof whichis quite different from the present concept forming a triangular spacein between projections @1 2 and 13.

f In a conventional electric wire insulating cover C,

rainwater, as it' falls dropwise from the jo nt lower edges of theprojections I2 and I3, is'likely to flow by capillary action between theprojections I 2: and I3 thereby allowing rainwater to infiltrate intothe cylindrical apparatus, which nullifics the insulating effect of theapparatus.

On the other hand. the electric wire insulating apparatus A in thepresent invention forms a triangular space between the projections I2and I3 which prevents the generation of the aforementioned capillaryaction of rainwater which destroys the insulating effect for this kindof electric wire insulator.

The insulating capacity is compared in various regards between thepresent concept and conventional apparatus in table I.

TABLE I In dried state Conventional Apparatus Present Invention25.0(lllV/l minute safety-secured 20,0[l0V/l minute safety-secured Inusual setting ltl,()tlllV/l minute safety-secured ZOAIUOVII minutesafety-secured In upside-down setting TABLE l-Continued ConventionalApparatus Present nvention In the state of touching with a fresh-verdure4.0006.000V causing short-circuit within l minute. burning Inwater-poured tree the apparatus and tree state In the state of6.l)007.0(l0V touching with in causing short-circuit wooden sign within1 minute. burning board the apparatus and sign board l5.000V/l minutesafety-secured 16.000V/l minute safety-seen red projections extendingoutwardly from said cylindrical body each situated a different shortdistance from one olsaid longitudinal straight edges. said projectionstouching each other at the outer ends thereof but separated at the innerends so as to from a triangular space between the two projections,

1. A covering arrangement for insulating electric wires comprising anelongated inwardly resilient flexible cylindrical body split along itslength so as to provide two longitudinal straight edges, sized to holdan electric wire therein, so constructed that the two longitudinal edgesoverlap, and two straight longitudinal projections extending outwardlyfrom said cylindrical body each situated a different short distance fromone of said longitudinal straight edges, said projections touching eachotHer at the outer ends thereof but separated at the inner ends so as tofrom a triangular space between the two projections.